Cyril of Jerusalem: Ignore Extra-Scriptural "Tradition" Regarding Mary

Cyril of Jerusalem (318-386): Now do not fix your attention on any skill of language on my part, for perhaps you may be deceived; unless you get the testimony of the prophets on each point, do not believe what is said. Unless you learn from the Holy Scriptures regarding the Virgin, the place, the time, the manner, “do not receive the witness of man.” For one who is now present and teaches may be open to suspicion; but what man of sense will suspect him who prophesied a thousand years ago and more? If then you seek the reason for Christ’s coming, go back to the first book of the Scriptures.

Fathers of the Church, Vol. 61, Catechesis XII.5 (Washington, D.C.: The Catholic University of America Press, Inc., 1969), p. 229.